Pipe-grapple.



J. E. MARTIN.

PIPE GRAPPLE.

APPLICATION FILED AUG.27, 1912.

Patented June 30, 191i q/vblimeooao UNITED STATES PATENT OFFICE.

JOHN E. MARTIN, 0F BAY CITY, TEXAS.

PIPE-GRAPPLE.

To all whom it may concern Be it known that I, JOHN E. MARTIN, a citizen of the United States, residing at Bay City, in the county of Matagorda and State of Texas, have invented new and useful Improvements in Pipe Grapples, of which the following is a specification.

This invention relates to pipe grapples.

One of the principal objects of this in vention is to provide a simple device of this character which is adapted to extend down on the inside of the pipe and when raised automatically grip the walls of the pipe sothat the same may be raised.

A further object of the invention is the provision of a device of this character which has a plurality of pivoted gripping dogs adapted to engage the interior walls of the pipe for raising the same, said dogs being operated so as to release the same from the pipe if necessary to raise the grapple out of the same.

Further objects of this invention will ap pear as the following specific description is read in connection with the accompanying drawing which forms a part of this invention, and in which,

Figure 1 is a side elevation. vFig. 2 is a similar view taken at right angles to Fig. 1.

Referring more particularly to the drawing 1 represents an elongated bar which is substantially square in cross section and which has its upper end apertured as shown at 2 to receive the hoisting cable 3. Pivoted to the lower end of the bar is a pair of pawls 4 arranged upon opposite sides of the bar and each providect with serrated or roughed faces 5 curved to conform to the outline of a pipe. Immediately above the pawls 4 there is pivoted a single pair of pawls 6 having serrated faces 7 and adapted to act at right angles to the pair of pawls a. Both pairs of pawls are freely movable so that when the device is lowered into the pipe or tubing the pawls will ride freely over the walls thereof, and when raised will auto- Specification of Letters Patent.

Application filed August 27, 1912.

Patented June 30, 1914. Serial No. 717,344.

matically grip the walls so as to make the grapple and pipe relatively stationary.

Slidable upon the bar 1 is a ring 8 which has connected thereto a loop 9 adapted to receive a tripping cable or cord 10. The ring 8 is connected by means of links 11 and 12 to the pairs of pawls 6 and 4 respectively so that when the tripping cable is raised, the outer ends of the pawls will all be elevated so as to disconnect the same from the walls of the pipe or tubing.

Having thus described the invention, what is claimed as new, is

In a device of the character described, in combination, a post, two pivots, tapped through said post at spaced apart points at one end, a pair of serrated dogs mounted at the opposite ends of each pintle, each of said dogs being provided with a lateral shoulder adapted to move toward opposite sides of said post, a ring encircling said post, one of said pintles being disposed at right angles to the other whereby to cause one of said pairs of dogs to be disposed at right angles to the other in position, rods linked at diametrically opposite points upon said ring, links carried by said rod and connected transversely of one of the pairs of dogs, a second pair of rods linked at diametrical points upon said ring in a plane at right angles to said first named rods, said last mentioned rodsbeing linked transversely to said second mentioned pair, of dogs, an inverted U- shaped member having eyes formed upon its ends, said eyes engaging said ring substantially within touching position of said second mentioned rods, said U-shaped member being disposed obliquely and outwardly of said post, and a flexible member connected to said U-shaped member.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN E. MARTIN.

WVitnesses:

L. H. l/VILLIAMS, A. B. HEAD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

